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Title: [3.12] gh-90949: add Expat API to prevent XML deadly allocations (CVE-2025-59375) (GH-139234) by hartwork · Pull Request #139527 · python/cpython · GitHub

Open Graph Title: [3.12] gh-90949: add Expat API to prevent XML deadly allocations (CVE-2025-59375) (GH-139234) by hartwork · Pull Request #139527 · python/cpython

X Title: [3.12] gh-90949: add Expat API to prevent XML deadly allocations (CVE-2025-59375) (GH-139234) by hartwork · Pull Request #139527 · python/cpython

Description: Expose the XML Expat 2.7.2 mitigation APIs to disallow use of disproportional amounts of dynamic memory from within an Expat parser (see CVE-2025-59375 for instance). The exposed APIs are available on Expat parsers, that is, parsers created by xml.parsers.expat.ParserCreate(), as: parser.SetAllocTrackerActivationThreshold(threshold), and parser.SetAllocTrackerMaximumAmplification(max_factor). (cherry picked from commit f04bea4) CC @picnixz Issue: gh-90949 📚 Documentation preview 📚: https://cpython-previews--139527.org.readthedocs.build/

Open Graph Description: Expose the XML Expat 2.7.2 mitigation APIs to disallow use of disproportional amounts of dynamic memory from within an Expat parser (see CVE-2025-59375 for instance). The exposed APIs are available...

X Description: Expose the XML Expat 2.7.2 mitigation APIs to disallow use of disproportional amounts of dynamic memory from within an Expat parser (see CVE-2025-59375 for instance). The exposed APIs are available...

Opengraph URL: https://github.com/python/cpython/pull/139527

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[3.12] gh-90949: add Expat API to prevent XML deadly allocations (CVE-2025-59375) (GH-139234) https://github.com/python/cpython/pull/139527/files#top
Show all changes 9 commits https://github.com/python/cpython/pull/139527/files
aeefb63 [3.12] gh-90949: add Expat API to prevent XML deadly allocations (CVE… picnixz Sep 26, 2025 https://github.com/python/cpython/pull/139527/commits/aeefb6374ea12bea1789d8a3c82ce270f689ec1b
a5d026a gh-90949: amend GH-139234 in prevision of future mitigation API (#139… picnixz Sep 26, 2025 https://github.com/python/cpython/pull/139527/commits/a5d026aa2975c9d817f5273b2584666801c5e570
2ab3e1d Make use of macro _Py_ID possible to pyexpat hartwork Oct 2, 2025 https://github.com/python/cpython/pull/139527/commits/2ab3e1d9243f8eae34ed82f494319f48b0a8e146
ce64f57 Add a temporary workaround for issue 139400 hartwork Oct 2, 2025 https://github.com/python/cpython/pull/139527/commits/ce64f570fcc9a2a575d07108a08d76694abd5dde
56896ae Add an empty commit to see how temporary the RTD CI fail is hartwork Oct 3, 2025 https://github.com/python/cpython/pull/139527/commits/56896ae04f249485de63c8ae62f1002c65173db4
6e97592 Revert introduction of stddef.h import hartwork Oct 3, 2025 https://github.com/python/cpython/pull/139527/commits/6e975926c73c623720f08b7a556bce4da9bb6790
bcab187 Merge remote-tracking branch 'upstream/3.12' into backport-f04bea4-3.12 hartwork Oct 7, 2025 https://github.com/python/cpython/pull/139527/commits/bcab1879b2a7d5d66e0f25f9660cb94f07dd7512
932d28d Drop workaround for 139400 as no-longer-needed hartwork Oct 7, 2025 https://github.com/python/cpython/pull/139527/commits/932d28d036e7c13f6b2b71a36d6c4b736697a042
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